year = 2020
if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
    print ("闰年")
else:
    print ("不是闰年")

if year % 100 == 0:
    if year % 400 == 0:
        print ("闰年")
    else:
        print ("不是闰年")
else:
    if year % 4 == 0:
        print("闰年")
    else:
        print("不是闰年")